10. If the message "ERROR CMD" is received instead, try sending your commands again; also check whether the commands inputted are correct or not.
11. Input “AT+EXIT” to exit AT Mode.
void setup() { Serial.begin(115200); //initial the Serial } void loop() { if(Serial.available()) { Serial.write(Serial.read()); //send what has been received } }
For IOS (iOS source code)